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Portable electronic machine for distinguishing genuine diamonds from diversified simulated . LCD display and LED display, powered by way of DC 9V battery x 1 (not included) If stone crystal, a simulant like zirconia (), there's no reaction. It is designed for a fast, accurate and secure diamond check colour:Black + silver Material:PC+ metallic size:16*4*2 Package Contents: 1 * Metals and Gem Tester 1 * LED Magnifier 1 * Test bench 1 * Instruction guide Only the above package content, varied item should not included. Note: Light and various exhibits can cause the colour of the article within the picture considerably diversified from the genuine thing. The dimension allowed error is +/- 1-3cm.